Back support for a folding seat



FIG. 1 is a perspective view of back support for a folding seat showing my new design showing it with a cushion in place;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a right side elevational view thereof, the left side being a mirror image. 

The ornamental design for a back support for a folding seat, as shown and described. 